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Poster: Jeff Kaplan Date: Feb 6, 2013 9:35am
Forum: audio_bookspoetry Subject: Re: Reduction in volume in derived files

what are you using to analyze the decibel level?

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Poster: librivoxbooks Date: Feb 8, 2013 4:39am
Forum: audio_bookspoetry Subject: Re: Reduction in volume in derived files

MP3Gain and/or our own Checker program. I think our Checker program uses a similar algorithm to MP3Gain, though.

Also the volume is clearly different in Audacity: you can amplify the 128kbps file by 1.8 dB to 0 dBFS, while the 64 kbps and OGG can be amplified by over 5 dB.

I chose those files as an example as they have a very even volume throughout nearly all the recording. Not allowing 0dBFS to be exceeded in Audacity means that there is a difference between these actual measurements and the measurement in MP3Gain (which is an average of the whole recording), but relative to each other, the 128 kbps, 64kbps MP3s and OGG still show the >3 dB difference.

Ruth

This post was modified by librivoxbooks on 2013-02-06 21:32:13

This post was modified by librivoxbooks on 2013-02-08 12:39:47